Linux System Administrator at ManTech

Secure our Nation, Ignite your Future

Become an integral part of a diverse team while working at an Industry Leading Organization, where our employees come first.  At ManTech International Corporation, you’ll help protect our national security while working on innovative projects that offer opportunities for advancement.

Currently, ManTech is seeking a motivated, career and customer-oriented System Administrator to join our team in the Columbia and Hanover, MD area.

Responsibilities include but not limited to:

• Linux sys admin functions (including OS loading, patching, LDAP, DNS, DHCP, Samba, SSH, VNC, user/group management, etc.)
• Setting up Linux servers and be able to share data between them and other computers often times Windows-based)
• Assessing system vulnerabilities (SecScan, Nessus, etc.), hardening systems (manually and applying hardening scripts) and performing system/application-level regression testing
• Implementing and administrating virus scanning applications
• Shell scripting (Bash, other) to help make system administration, troubleshooting and automation tasks more efficient
• Windows sys admin functions (including OS loading, patching, Active Directory, Remote Desktop, virus scanning applications, Policy changes/implementation, etc.)
• Setting up Windows servers (Server 2019, Server 2022, etc.) and clients (e.g., Win7, Win8, Win10, Win11) and ensure data can be shared between them and Linux servers
• Assessing system vulnerabilities (DirtScan, dirty word searches, Nessus, etc.), hardening systems (manually and applying hardening scripts), and performing system/application-level regression testing

Basic Qualifications:

• Ten (10) years experience as a SA in programs and contracts of similar scope, type, and complexity is required.
• Bachelor’s degree in a technical discipline from an accredited college or university is required. Five (5) years of additional SA experience may be substituted for a bachelor’s degree.

Preferred Qualifications:

• Meet IAT Level II – ex. Security+ (Sec+) OR be able to secure Sec+ certification or higher.
• Basic understanding of the Risk Management Framework (RMF) requirements and processes
• Basic router and switch and switch configuration knowledge, necessary for configuration and/or system hardening and compliance scanning requirement.
• Elastic (ELK) Stack configuration and user experience
• Experience using Power shell scripting experience to help make system administration, troubleshooting and automation tasks more efficient
• Experience installing, integrating, and troubleshooting GOTS/COTS Software/Applications on Windows and Linux servers (e.g., ability to take provided applications, install, and troubleshoot installation/running on the server)

Security Clearance Requirements:

• Current and active TS/SCI with Polygraph

For all positions requiring access to technology/software source code that is subject to export control laws, employment with the company is contingent on either verifying U.S.-person status or obtaining any necessary license. The applicant will be required to answer certain questions for export control purposes, and that information will be reviewed by compliance personnel to ensure compliance with federal law. ManTech may choose not to apply for a license for such individuals whose access to export-controlled technology or software source code may require authorization and may decline to proceed with an applicant on that basis alone.

ManTech International Corporation, as well as its subsidiaries proactively fulfills its role as an equal opportunity employer. We do not discriminate against any employee or applicant for employment because of race, color, sex, religion, age, sexual orientation, gender identity and expression, national origin, marital status, physical or mental disability, status as a Disabled Veteran, Recently Separated Veteran, Active Duty Wartime or Campaign Badge Veteran, Armed Forces Services Medal, or any other characteristic protected by law.

If you require a reasonable accommodation to apply for a position with ManTech through its online applicant system, please contact ManTech's Corporate EEO Department at

. ManTech is an affirmative action/equal opportunity employer - minorities, females, disabled and protected veterans are urged to apply. ManTech's utilization of any external recruitment or job placement agency is predicated upon its full compliance with our equal opportunity/affirmative action policies. ManTech does not accept resumes from unsolicited recruiting firms. We pay no fees for unsolicited services.

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